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Controller Diagnostics Diagnostics
Revision 9 900 Control Station User Guide 37
May 2014
Controller Diagnostics
Select a rack number to see its diagnostics. For I/O diagnostics and details, see pages 42 and 43.
Table 19 Rack n diagnostics
Item Status Possible Cause Controller Action What to do
Rack
Configured?
YES N/A N/A N/A
NO N/A N/A N/A
Controller
Status
GOOD N/A N/A N/A
FORCED OUTPUT
A block has an output
that is forced.
None Remove force on block output..
INVALID CONFIG.
A configuration that
exceeds the loop
capacity of the
controller was
downloaded or an
invalid configuration
exists.
An empty database is
created.
Download a valid configuration.
SWITCH FAULT
A failure is detected in
the switch reading.
1. All control blocks stop
running
2. All I/O scanning ceases.
This forces the modules
into failsafe.
Replace CPU.
NO MASTER
PORT
The controller
configuration contains
at least one Modbus
slave block, but
neither the RS-232
nor the RS-485 port is
set up as a Modbus
Master port.
The controller is not
scanning the Modbus
slave devices.
Select Modbus Master or Modbus
Master Advanced protocol for either the
RS-232 or RS-485 port.
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